Fitbit Flex Wireless Activity + Sleep Wristband, Black, Small/Large
- ...tracking. Charge time: One to two hours. Battery life: up to 7 - 10 days. Battery type: Lithium-polymer.
- Syncs with Windows Vista and later, Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, and leading Android and Windows devices.
- Tracks steps, distance, calories burned and active minutes.
- Wakes you (and not your partner) with a silent wake alarm.
- LED lights show how your day is stacking up against your goal.
- Slim, comfortable and easy to wear (sold with both large and small wristbands included with an interchangeable clasp).
- Sync stats wirelessly and automatically to your computer and over 150 leading smartphones.
- 1 wristband which acts both as an Activity & Sleep wristband. There is no seperate Sleep wristband..